What Hardware I need?

Hello,
we want to develope a application who should use a Oracle database. But we did not exactly know what traffic or transactions occurs.
But we still know the user count. The amount of users are 400 concurrent users. 30% power users and 70% low profile users. The transactions from the application might be medium to complex.
Is there any document or white paper where a rough sizing is declared?
With which hardware requirements should I calculate?
I hope anybody can help me. I know, this question is asked really often, but a lot of the questions are not answered and the rest is not exactly that what I need.
Thank you in advance!
Johannes

It is impossible to give any useful answer to a question such as:
"for an application, which hardware do we need?"
To start with, try to describe the application design and architecture.Thank you for your quick answer.
I know that it is quiet impossible to give a good answer with such much variables. But I will try to explain the details I am currently know.
The application runs on a application server. The client program communicate only with the application server. All transactions from the database will communicate between the application server and database server.
The application mainly requests data, put it in a form. The user can edit the data and send it back. But there are also reporting features in the application who requests a lot of data and calculate and ...
The problem is: At the moment we don't know exactly how much data it is, because the application is not developed. We still have a prototype, but the demanding from the customer is sophisticated.
What do you mean by concurrent here? Power users? Low profile users? No batch >jobs? What's a medium transaction like? Complex? .....
Sorry but there's just too many unknowns to resolve this "equation".400 Concurrent users are at one time 400 users are connected. Everytime 400 users are connected.
Power users are users who do very often actions in the application. Every half minute I guess and Low profile users do every 5 or 10 minutes a action. At the moment no batch job is defined.
A medium transaction is a query where some data will be requested from the database and a complex is a query with calculating and sorting (for the reporting functionality). But sorry, I can not define it more detail, because we didn't know the exact definitions for the application (it is in work).
The customer wants a suggestion for the hardware and we have to give them.
Well, for the 400 simultaneously active users (if this is what you mean by concurrent), >you need some amount of CPU and RAM to support the required processes.
What about data volume and growth?
Please provide more info if you want a chance of getting useful feedback :) Yes, you're right with the 400 simultaneously active users. It will be good to know the amount of CPU and RAM the users covers for minimum.
The initial data should be 250 GB. I don't know the growth, but I think it will be 250 MB per day (normally it should be lower, but bigger is everytime better :D ).
We plan to use for the data holding by a Storage Area Network, I think the I/O should not be the problem.
I know this information is not enough to give a exactly feedback. But anyhow we need a rough valuing of the hardware. Bigger is better.
Maybe there are some white papers where are the transaction volume are documentated to calculate some requirements with the developers or any similar descriptions about sizing.
For the data availabilty do you recommend grid computing or make a cluster?
Sorry, but more information I do not have. I have also a lot of difficulties to calculate the system with such much unknowns. If time comes it would be better, because then the application is defined and many other unknowns will be cleared. I only need the information to make a quick hardware requirement and can say "okay customer, the hardware costs round about a million dollar" or "it is a good day for you, you can geht the hardware by round about 100thousand dollar". 20% up or down doesn't matter. Bigger is better :)
I talked enough, let me know if this information is right enough for you.

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